Enroute Flight - Kazan Helicopters Mi-17-1V Flight Manual

M,,·17·1B. Flight manual
(locator beacon) located at the initial waypoint, set the yrp-4YK (or nHn-
72-15)indicator heading selector to the first route leg track angle when
approaching the station. Determine the moment of passing over the initial
waypoint (station) by 180-deg reversal of the ADF pointer.
(8) On passing the omnirange station (locator beacon) proceed to selection
of the heading using the yrp-4YK (or nHn-72-15)indicator. When the
helicopter flies precisely on the desired track the pointers of ADF indica-
tor and heading selector remain aligned.
If the ADF indicator pointer deviates to the left or to the right from the head-
ing selector pointer (this event being caused by the helicopter drift) turn the
helicopter in a direction opposite to deflection of the ADF pointer rear end.
Continue turning until the heading selector pointer is midway between the
yrp-4YK (or nHn-72-15) indicator triangle index and the ADF pointer rear
end. Then fly on a straight line and as soon as the angle between the ADF
pointer rear end and the heading selector pointer decreases, smoothly turn
the helicopter towards the ADF pointer rear end until both pointers are
completely aligned. This done, note the magnetic heading graduation
aligned with the triangle index of the yrp-4YK (or nHn-72-15) indicator,
and maintain this heading, keeping the ADF and heading selector point-
ers aligned.
(9) When flying from the locator beacon bring the helicopter to the heading
equal to the desired track angle and note the time of flyover. Fly 3 to 5
minutes and request for the magnetic radio bearing (MRB)
(np~60ii1)
and
calculate the helicopter magnetic bearing (MB) (MB
=
MHB ± 180°) which
is the actual magnetic track angle.
(10) Proceeding from the helicopter magnetic bearing determine the direction
and the amount of cross track error. To roll out on the desired track intro-
duce the correction equal to twice the drift angle into the heading:
MH
2
=
MH
1 -
(±2DA)
On this heading the helicopter will capture the desired track in the same
time interval as after passing the locator beacon by the moment of
correction of the heading (3 to 5 minutes). Upon expiration of this time re-
quest for radio bearing to make sure helicopter flies on the desired track.
While flying on the desired track, turn the helicopter to a new magnetic
heading MH,) with a drift angle considered to fly the desired track.
4.24.3. Enroute Flight
(1) When flying on a selected route monitor the on-course condition and in-
troduce necessary corrections in distance and heading.
The navigation control is effected by determination of the helicopter fix by
reading the co-ordinate indicator, by ground contact or by means of the
radio navigation aids.
(2) When flying on a primary great circle course (using primary great circle
spherical co-ordinates) and approaching the next way point, compare the
waypoint rectangular co-ordinates on the chart with the readings of the
.QIIICC-15 doppler system co-ordinate indicator. When approaching the
waypoint determine the dead reckoning error and, if necessary, update
the present position by momentarily depressing the RIGHT (BnPABO) -
LEFT (BnEBO), FORWARD (BnEPE.Q) - BACKWARD (HA3A.Q) keys to
set the desired values of the waypoint spherical co-ordinates to the XTK
DISTANCE (km) (60KOBOE YKnOHEHIIIE -
KM)
and TRACK (km)
(nYTb -
KM)
digital readouts. Perform similar operations when approach-
ing the reference point of known rectangular co-ordinates and subse-
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